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st: heckman model

From   "[email protected]" <[email protected]>
To   [email protected]
Subject   st: heckman model
Date   Mon, 17 Jan 2011 15:37:36 +0100 (CET)

Dear Stata users,

I have a doubt regarding the Heckman procedure (heckman command).

Why is the estimate of rho different than the estimated coefficient of  
lambda? Is rho here defined as the correlation coefficient between the 
estimated residuals of the two equations?

Thanks a lot,

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